From d8e85e144bbe12e8d82c6b05d690a34da62cc991 Mon Sep 17 00:00:00 2001

From: Anders Roxell <anders.roxell@linaro.org>

Date: Wed, 13 Nov 2019 10:26:52 +0100

Subject: [PATCH] arm64: Kconfig: add a choice for endianness

Git-commit: d8e85e144bbe12e8d82c6b05d690a34da62cc991

Patch-mainline: v5.5-rc1

References: jsc#SLE-23432

When building allmodconfig KCONFIG_ALLCONFIG=$(pwd)/arch/arm64/configs/defconfig

CONFIG_CPU_BIG_ENDIAN gets enabled. Which tends not to be what most

people want. Another concern that has come up is that ACPI isn't built

for an allmodconfig kernel today since that also depends on !CPU_BIG_ENDIAN.

Rework so that we introduce a 'choice' and default the choice to

CPU_LITTLE_ENDIAN. That means that when we build an allmodconfig kernel

it will default to CPU_LITTLE_ENDIAN that most people tends to want.

Reviewed-by: John Garry <john.garry@huawei.com>

Acked-by: Will Deacon <will@kernel.org>

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Acked-by: Chester Lin <clin@suse.com>

---

 arch/arm64/Kconfig | 18 +++++++++++++++++-

 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig

index 8a0800e5be9d..d66a9727344d 100644

--- a/arch/arm64/Kconfig

+++ b/arch/arm64/Kconfig

@@ -877,10 +877,26 @@ config ARM64_PA_BITS

 	default 48 if ARM64_PA_BITS_48

 	default 52 if ARM64_PA_BITS_52

+choice

+	prompt "Endianness"

+	default CPU_LITTLE_ENDIAN

+	help

+	  Select the endianness of data accesses performed by the CPU. Userspace

+	  applications will need to be compiled and linked for the endianness

+	  that is selected here.

+

 config CPU_BIG_ENDIAN

        bool "Build big-endian kernel"

        help

-         Say Y if you plan on running a kernel in big-endian mode.

+	  Say Y if you plan on running a kernel with a big-endian userspace.

+

+config CPU_LITTLE_ENDIAN

+	bool "Build little-endian kernel"

+	help

+	  Say Y if you plan on running a kernel with a little-endian userspace.

+	  This is usually the case for distributions targeting arm64.

+

+endchoice

 config SCHED_MC

 	bool "Multi-core scheduler support"

-- 

2.33.1